Thanks for the review.
I just got confirmation that the snapping not working with gizmos is a Blender bug, until that is fixed, there is nothing I can do about it.
You can snapp incrementaly by dragging the slider instead in the modifier panel while holding Ctrl.
This is truly an amazing plugin that has been integrated into my workflow, but I still feel a little bit of a pity. When changing the size by moving axis, can there be a function of snapping increments by holding down the Ctrl key?